1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * NVIDIA Tegra DRM GEM helper functions 4 * 5 * Copyright (C) 2012 Sascha Hauer, Pengutronix 6 * Copyright (C) 2013-2015 NVIDIA CORPORATION, All rights reserved. 7 * 8 * Based on the GEM/CMA helpers 9 * 10 * Copyright (c) 2011 Samsung Electronics Co., Ltd. 11 */ 12 13 #include <linux/dma-buf.h> 14 #include <linux/iommu.h> 15 16 #include <drm/drm_drv.h> 17 #include <drm/drm_prime.h> 18 #include <drm/tegra_drm.h> 19 20 #include "drm.h" 21 #include "gem.h" 22 23 static void tegra_bo_put(struct host1x_bo *bo) 24 { 25 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 26 27 drm_gem_object_put_unlocked(&obj->gem); 28 } 29 30 static struct sg_table *tegra_bo_pin(struct device *dev, struct host1x_bo *bo, 31 dma_addr_t *phys) 32 { 33 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 34 struct sg_table *sgt; 35 int err; 36 37 /* 38 * If we've manually mapped the buffer object through the IOMMU, make 39 * sure to return the IOVA address of our mapping. 40 */ 41 if (phys && obj->mm) { 42 *phys = obj->iova; 43 return NULL; 44 } 45 46 /* 47 * If we don't have a mapping for this buffer yet, return an SG table 48 * so that host1x can do the mapping for us via the DMA API. 49 */ 50 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); 51 if (!sgt) 52 return ERR_PTR(-ENOMEM); 53 54 if (obj->pages) { 55 err = sg_alloc_table_from_pages(sgt, obj->pages, obj->num_pages, 56 0, obj->gem.size, GFP_KERNEL); 57 if (err < 0) 58 goto free; 59 } else { 60 err = dma_get_sgtable(dev, sgt, obj->vaddr, obj->iova, 61 obj->gem.size); 62 if (err < 0) 63 goto free; 64 } 65 66 return sgt; 67 68 free: 69 kfree(sgt); 70 return ERR_PTR(err); 71 } 72 73 static void tegra_bo_unpin(struct device *dev, struct sg_table *sgt) 74 { 75 if (sgt) { 76 sg_free_table(sgt); 77 kfree(sgt); 78 } 79 } 80 81 static void *tegra_bo_mmap(struct host1x_bo *bo) 82 { 83 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 84 85 if (obj->vaddr) 86 return obj->vaddr; 87 else if (obj->gem.import_attach) 88 return dma_buf_vmap(obj->gem.import_attach->dmabuf); 89 else 90 return vmap(obj->pages, obj->num_pages, VM_MAP, 91 pgprot_writecombine(PAGE_KERNEL)); 92 } 93 94 static void tegra_bo_munmap(struct host1x_bo *bo, void *addr) 95 { 96 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 97 98 if (obj->vaddr) 99 return; 100 else if (obj->gem.import_attach) 101 dma_buf_vunmap(obj->gem.import_attach->dmabuf, addr); 102 else 103 vunmap(addr); 104 } 105 106 static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page) 107 { 108 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 109 110 if (obj->vaddr) 111 return obj->vaddr + page * PAGE_SIZE; 112 else if (obj->gem.import_attach) 113 return dma_buf_kmap(obj->gem.import_attach->dmabuf, page); 114 else 115 return vmap(obj->pages + page, 1, VM_MAP, 116 pgprot_writecombine(PAGE_KERNEL)); 117 } 118 119 static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page, 120 void *addr) 121 { 122 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 123 124 if (obj->vaddr) 125 return; 126 else if (obj->gem.import_attach) 127 dma_buf_kunmap(obj->gem.import_attach->dmabuf, page, addr); 128 else 129 vunmap(addr); 130 } 131 132 static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo) 133 { 134 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 135 136 drm_gem_object_get(&obj->gem); 137 138 return bo; 139 } 140 141 static const struct host1x_bo_ops tegra_bo_ops = { 142 .get = tegra_bo_get, 143 .put = tegra_bo_put, 144 .pin = tegra_bo_pin, 145 .unpin = tegra_bo_unpin, 146 .mmap = tegra_bo_mmap, 147 .munmap = tegra_bo_munmap, 148 .kmap = tegra_bo_kmap, 149 .kunmap = tegra_bo_kunmap, 150 }; 151 152 static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo) 153 { 154 int prot = IOMMU_READ | IOMMU_WRITE; 155 int err; 156 157 if (bo->mm) 158 return -EBUSY; 159 160 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL); 161 if (!bo->mm) 162 return -ENOMEM; 163 164 mutex_lock(&tegra->mm_lock); 165 166 err = drm_mm_insert_node_generic(&tegra->mm, 167 bo->mm, bo->gem.size, PAGE_SIZE, 0, 0); 168 if (err < 0) { 169 dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n", 170 err); 171 goto unlock; 172 } 173 174 bo->iova = bo->mm->start; 175 176 bo->size = iommu_map_sg(tegra->domain, bo->iova, bo->sgt->sgl, 177 bo->sgt->nents, prot); 178 if (!bo->size) { 179 dev_err(tegra->drm->dev, "failed to map buffer\n"); 180 err = -ENOMEM; 181 goto remove; 182 } 183 184 mutex_unlock(&tegra->mm_lock); 185 186 return 0; 187 188 remove: 189 drm_mm_remove_node(bo->mm); 190 unlock: 191 mutex_unlock(&tegra->mm_lock); 192 kfree(bo->mm); 193 return err; 194 } 195 196 static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo) 197 { 198 if (!bo->mm) 199 return 0; 200 201 mutex_lock(&tegra->mm_lock); 202 iommu_unmap(tegra->domain, bo->iova, bo->size); 203 drm_mm_remove_node(bo->mm); 204 mutex_unlock(&tegra->mm_lock); 205 206 kfree(bo->mm); 207 208 return 0; 209 } 210 211 static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm, 212 size_t size) 213 { 214 struct tegra_bo *bo; 215 int err; 216 217 bo = kzalloc(sizeof(*bo), GFP_KERNEL); 218 if (!bo) 219 return ERR_PTR(-ENOMEM); 220 221 host1x_bo_init(&bo->base, &tegra_bo_ops); 222 size = round_up(size, PAGE_SIZE); 223 224 err = drm_gem_object_init(drm, &bo->gem, size); 225 if (err < 0) 226 goto free; 227 228 err = drm_gem_create_mmap_offset(&bo->gem); 229 if (err < 0) 230 goto release; 231 232 return bo; 233 234 release: 235 drm_gem_object_release(&bo->gem); 236 free: 237 kfree(bo); 238 return ERR_PTR(err); 239 } 240 241 static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo) 242 { 243 if (bo->pages) { 244 dma_unmap_sg(drm->dev, bo->sgt->sgl, bo->sgt->nents, 245 DMA_FROM_DEVICE); 246 drm_gem_put_pages(&bo->gem, bo->pages, true, true); 247 sg_free_table(bo->sgt); 248 kfree(bo->sgt); 249 } else if (bo->vaddr) { 250 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->iova); 251 } 252 } 253 254 static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo) 255 { 256 int err; 257 258 bo->pages = drm_gem_get_pages(&bo->gem); 259 if (IS_ERR(bo->pages)) 260 return PTR_ERR(bo->pages); 261 262 bo->num_pages = bo->gem.size >> PAGE_SHIFT; 263 264 bo->sgt = drm_prime_pages_to_sg(bo->pages, bo->num_pages); 265 if (IS_ERR(bo->sgt)) { 266 err = PTR_ERR(bo->sgt); 267 goto put_pages; 268 } 269 270 err = dma_map_sg(drm->dev, bo->sgt->sgl, bo->sgt->nents, 271 DMA_FROM_DEVICE); 272 if (err == 0) { 273 err = -EFAULT; 274 goto free_sgt; 275 } 276 277 return 0; 278 279 free_sgt: 280 sg_free_table(bo->sgt); 281 kfree(bo->sgt); 282 put_pages: 283 drm_gem_put_pages(&bo->gem, bo->pages, false, false); 284 return err; 285 } 286 287 static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo) 288 { 289 struct tegra_drm *tegra = drm->dev_private; 290 int err; 291 292 if (tegra->domain) { 293 err = tegra_bo_get_pages(drm, bo); 294 if (err < 0) 295 return err; 296 297 err = tegra_bo_iommu_map(tegra, bo); 298 if (err < 0) { 299 tegra_bo_free(drm, bo); 300 return err; 301 } 302 } else { 303 size_t size = bo->gem.size; 304 305 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->iova, 306 GFP_KERNEL | __GFP_NOWARN); 307 if (!bo->vaddr) { 308 dev_err(drm->dev, 309 "failed to allocate buffer of size %zu\n", 310 size); 311 return -ENOMEM; 312 } 313 } 314 315 return 0; 316 } 317 318 struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size, 319 unsigned long flags) 320 { 321 struct tegra_bo *bo; 322 int err; 323 324 bo = tegra_bo_alloc_object(drm, size); 325 if (IS_ERR(bo)) 326 return bo; 327 328 err = tegra_bo_alloc(drm, bo); 329 if (err < 0) 330 goto release; 331 332 if (flags & DRM_TEGRA_GEM_CREATE_TILED) 333 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED; 334 335 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP) 336 bo->flags |= TEGRA_BO_BOTTOM_UP; 337 338 return bo; 339 340 release: 341 drm_gem_object_release(&bo->gem); 342 kfree(bo); 343 return ERR_PTR(err); 344 } 345 346 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file, 347 struct drm_device *drm, 348 size_t size, 349 unsigned long flags, 350 u32 *handle) 351 { 352 struct tegra_bo *bo; 353 int err; 354 355 bo = tegra_bo_create(drm, size, flags); 356 if (IS_ERR(bo)) 357 return bo; 358 359 err = drm_gem_handle_create(file, &bo->gem, handle); 360 if (err) { 361 tegra_bo_free_object(&bo->gem); 362 return ERR_PTR(err); 363 } 364 365 drm_gem_object_put_unlocked(&bo->gem); 366 367 return bo; 368 } 369 370 static struct tegra_bo *tegra_bo_import(struct drm_device *drm, 371 struct dma_buf *buf) 372 { 373 struct tegra_drm *tegra = drm->dev_private; 374 struct dma_buf_attachment *attach; 375 struct tegra_bo *bo; 376 int err; 377 378 bo = tegra_bo_alloc_object(drm, buf->size); 379 if (IS_ERR(bo)) 380 return bo; 381 382 attach = dma_buf_attach(buf, drm->dev); 383 if (IS_ERR(attach)) { 384 err = PTR_ERR(attach); 385 goto free; 386 } 387 388 get_dma_buf(buf); 389 390 bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE); 391 if (IS_ERR(bo->sgt)) { 392 err = PTR_ERR(bo->sgt); 393 goto detach; 394 } 395 396 if (tegra->domain) { 397 err = tegra_bo_iommu_map(tegra, bo); 398 if (err < 0) 399 goto detach; 400 } else { 401 if (bo->sgt->nents > 1) { 402 err = -EINVAL; 403 goto detach; 404 } 405 406 bo->iova = sg_dma_address(bo->sgt->sgl); 407 } 408 409 bo->gem.import_attach = attach; 410 411 return bo; 412 413 detach: 414 if (!IS_ERR_OR_NULL(bo->sgt)) 415 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE); 416 417 dma_buf_detach(buf, attach); 418 dma_buf_put(buf); 419 free: 420 drm_gem_object_release(&bo->gem); 421 kfree(bo); 422 return ERR_PTR(err); 423 } 424 425 void tegra_bo_free_object(struct drm_gem_object *gem) 426 { 427 struct tegra_drm *tegra = gem->dev->dev_private; 428 struct tegra_bo *bo = to_tegra_bo(gem); 429 430 if (tegra->domain) 431 tegra_bo_iommu_unmap(tegra, bo); 432 433 if (gem->import_attach) { 434 dma_buf_unmap_attachment(gem->import_attach, bo->sgt, 435 DMA_TO_DEVICE); 436 drm_prime_gem_destroy(gem, NULL); 437 } else { 438 tegra_bo_free(gem->dev, bo); 439 } 440 441 drm_gem_object_release(gem); 442 kfree(bo); 443 } 444 445 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm, 446 struct drm_mode_create_dumb *args) 447 { 448 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); 449 struct tegra_drm *tegra = drm->dev_private; 450 struct tegra_bo *bo; 451 452 args->pitch = round_up(min_pitch, tegra->pitch_align); 453 args->size = args->pitch * args->height; 454 455 bo = tegra_bo_create_with_handle(file, drm, args->size, 0, 456 &args->handle); 457 if (IS_ERR(bo)) 458 return PTR_ERR(bo); 459 460 return 0; 461 } 462 463 static vm_fault_t tegra_bo_fault(struct vm_fault *vmf) 464 { 465 struct vm_area_struct *vma = vmf->vma; 466 struct drm_gem_object *gem = vma->vm_private_data; 467 struct tegra_bo *bo = to_tegra_bo(gem); 468 struct page *page; 469 pgoff_t offset; 470 471 if (!bo->pages) 472 return VM_FAULT_SIGBUS; 473 474 offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT; 475 page = bo->pages[offset]; 476 477 return vmf_insert_page(vma, vmf->address, page); 478 } 479 480 const struct vm_operations_struct tegra_bo_vm_ops = { 481 .fault = tegra_bo_fault, 482 .open = drm_gem_vm_open, 483 .close = drm_gem_vm_close, 484 }; 485 486 int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma) 487 { 488 struct tegra_bo *bo = to_tegra_bo(gem); 489 490 if (!bo->pages) { 491 unsigned long vm_pgoff = vma->vm_pgoff; 492 int err; 493 494 /* 495 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(), 496 * and set the vm_pgoff (used as a fake buffer offset by DRM) 497 * to 0 as we want to map the whole buffer. 498 */ 499 vma->vm_flags &= ~VM_PFNMAP; 500 vma->vm_pgoff = 0; 501 502 err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->iova, 503 gem->size); 504 if (err < 0) { 505 drm_gem_vm_close(vma); 506 return err; 507 } 508 509 vma->vm_pgoff = vm_pgoff; 510 } else { 511 pgprot_t prot = vm_get_page_prot(vma->vm_flags); 512 513 vma->vm_flags |= VM_MIXEDMAP; 514 vma->vm_flags &= ~VM_PFNMAP; 515 516 vma->vm_page_prot = pgprot_writecombine(prot); 517 } 518 519 return 0; 520 } 521 522 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma) 523 { 524 struct drm_gem_object *gem; 525 int err; 526 527 err = drm_gem_mmap(file, vma); 528 if (err < 0) 529 return err; 530 531 gem = vma->vm_private_data; 532 533 return __tegra_gem_mmap(gem, vma); 534 } 535 536 static struct sg_table * 537 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach, 538 enum dma_data_direction dir) 539 { 540 struct drm_gem_object *gem = attach->dmabuf->priv; 541 struct tegra_bo *bo = to_tegra_bo(gem); 542 struct sg_table *sgt; 543 544 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL); 545 if (!sgt) 546 return NULL; 547 548 if (bo->pages) { 549 if (sg_alloc_table_from_pages(sgt, bo->pages, bo->num_pages, 550 0, gem->size, GFP_KERNEL) < 0) 551 goto free; 552 } else { 553 if (dma_get_sgtable(attach->dev, sgt, bo->vaddr, bo->iova, 554 gem->size) < 0) 555 goto free; 556 } 557 558 if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0) 559 goto free; 560 561 return sgt; 562 563 free: 564 sg_free_table(sgt); 565 kfree(sgt); 566 return NULL; 567 } 568 569 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach, 570 struct sg_table *sgt, 571 enum dma_data_direction dir) 572 { 573 struct drm_gem_object *gem = attach->dmabuf->priv; 574 struct tegra_bo *bo = to_tegra_bo(gem); 575 576 if (bo->pages) 577 dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir); 578 579 sg_free_table(sgt); 580 kfree(sgt); 581 } 582 583 static void tegra_gem_prime_release(struct dma_buf *buf) 584 { 585 drm_gem_dmabuf_release(buf); 586 } 587 588 static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf, 589 enum dma_data_direction direction) 590 { 591 struct drm_gem_object *gem = buf->priv; 592 struct tegra_bo *bo = to_tegra_bo(gem); 593 struct drm_device *drm = gem->dev; 594 595 if (bo->pages) 596 dma_sync_sg_for_cpu(drm->dev, bo->sgt->sgl, bo->sgt->nents, 597 DMA_FROM_DEVICE); 598 599 return 0; 600 } 601 602 static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf, 603 enum dma_data_direction direction) 604 { 605 struct drm_gem_object *gem = buf->priv; 606 struct tegra_bo *bo = to_tegra_bo(gem); 607 struct drm_device *drm = gem->dev; 608 609 if (bo->pages) 610 dma_sync_sg_for_device(drm->dev, bo->sgt->sgl, bo->sgt->nents, 611 DMA_TO_DEVICE); 612 613 return 0; 614 } 615 616 static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page) 617 { 618 return NULL; 619 } 620 621 static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page, 622 void *addr) 623 { 624 } 625 626 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma) 627 { 628 struct drm_gem_object *gem = buf->priv; 629 int err; 630 631 err = drm_gem_mmap_obj(gem, gem->size, vma); 632 if (err < 0) 633 return err; 634 635 return __tegra_gem_mmap(gem, vma); 636 } 637 638 static void *tegra_gem_prime_vmap(struct dma_buf *buf) 639 { 640 struct drm_gem_object *gem = buf->priv; 641 struct tegra_bo *bo = to_tegra_bo(gem); 642 643 return bo->vaddr; 644 } 645 646 static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr) 647 { 648 } 649 650 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = { 651 .map_dma_buf = tegra_gem_prime_map_dma_buf, 652 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf, 653 .release = tegra_gem_prime_release, 654 .begin_cpu_access = tegra_gem_prime_begin_cpu_access, 655 .end_cpu_access = tegra_gem_prime_end_cpu_access, 656 .map = tegra_gem_prime_kmap, 657 .unmap = tegra_gem_prime_kunmap, 658 .mmap = tegra_gem_prime_mmap, 659 .vmap = tegra_gem_prime_vmap, 660 .vunmap = tegra_gem_prime_vunmap, 661 }; 662 663 struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem, 664 int flags) 665 { 666 DEFINE_DMA_BUF_EXPORT_INFO(exp_info); 667 668 exp_info.exp_name = KBUILD_MODNAME; 669 exp_info.owner = gem->dev->driver->fops->owner; 670 exp_info.ops = &tegra_gem_prime_dmabuf_ops; 671 exp_info.size = gem->size; 672 exp_info.flags = flags; 673 exp_info.priv = gem; 674 675 return drm_gem_dmabuf_export(gem->dev, &exp_info); 676 } 677 678 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm, 679 struct dma_buf *buf) 680 { 681 struct tegra_bo *bo; 682 683 if (buf->ops == &tegra_gem_prime_dmabuf_ops) { 684 struct drm_gem_object *gem = buf->priv; 685 686 if (gem->dev == drm) { 687 drm_gem_object_get(gem); 688 return gem; 689 } 690 } 691 692 bo = tegra_bo_import(drm, buf); 693 if (IS_ERR(bo)) 694 return ERR_CAST(bo); 695 696 return &bo->gem; 697 } 698